Historical Weather in Costa Mesa, CA
See 55+ years of weather history for any date in Costa Mesa going back to 1970.
Part of California weather history
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Today in Costa Mesa Weather HistorySee records, averages, and 55+ years of data for today's date
→Monthly Climate Averages
Historical temperature and precipitation averages for Costa Mesa, CA, based on 55+ years of weather data.
Warmest MonthAugustAvg High: 84°F / Low: 65°F
Coldest MonthDecemberAvg High: 68°F / Low: 47°F
Jan
69°/ 47°
💧 10.3"
Feb
69°/ 48°
💧 10.8"
Mar
70°/ 50°
💧 8.7"
Apr
73°/ 53°
💧 5.5"
May
74°/ 57°
💧 3.6"
Jun
78°/ 61°
💧 2.4"
Jul
82°/ 64°
💧 1.8"
Aug
84°/ 65°
💧 7.0"
Sep
83°/ 63°
💧 5.6"
Oct
79°/ 58°
💧 5.1"
Nov
74°/ 51°
💧 7.3"
Dec
68°/ 47°
💧 8.9"
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Costa Mesa Temperature Records
- Record High: The hottest temperature ever recorded in Costa Mesa, CA is 115°F, set on July 6, 2018.
- Record Low: The coldest temperature ever recorded in Costa Mesa, CA is 16°F, set on January 12, 1989.
- Data Coverage: Based on 28 years of data from NOAA weather station: SANTA ANA JOHN WAYNE AP.
All-Time Record High
115°F
July 6, 2018
All-Time Record Low
16°F
January 12, 1989
Monthly Temperature Records in Costa Mesa
| Month | Record High | Record Low |
|---|---|---|
| January | 96°F(2003) | 16°F(1989) |
| February | 97°F(2016) | 22°F(1989) |
| March | 98°F(2015) | 31°F(2023) |
| April | 106°F(2004) | 34°F(1975) |
| May | 106°F(2004) | 39°F(2000) |
| June | 110°F(2016) | 45°F(2011) |
| July | 115°F(2018) | 50°F(2012) |
| August | 107°F(2020) | 50°F(2010) |
| September | 113°F(2010) | 42°F(2006) |
| October | 107°F(1991) | 32°F(1971) |
| November | 102°F(2010) | 33°F(1994) |
| December | 92°F(1979) | 24°F(1988) |
Costa Mesa Snow RecordsSee the top 10 snowiest days ever recorded
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